The GOP presidential hopeful drew boos and groans Friday at the Wisconsin Republican Party convention when he used a football analogy to talk about the need to focus on families.

“This is fundamental blocking and tackling,” he said. “This is your line in football. If you don’t have a line, how many passes can Peyton Manning complete? Greatest quarterback, maybe, in NFL history.”

Oops, wrong team to mention in Wisconsin, once described by Gov. Tommy Thompson as the place “where eagles soar, Harleys roar and Packers score.”

Realizing what he had said, the Kansas Republican slumped at the podium and put his head in his hands.

“That’s really bad,” he said. “That will go down in history. I apologize.”

His apology brought a smattering of applause and laughter. He tried to recover, saying former Packer Bart Starr may be the greatest of all time, but the crowd was still restless.